As shown in the following networking, the interfaces connecting R1, R2, R3, R4, and R5 are running OSPF, and are all in area 0. The routing table of R1 has two equal-cost routes to... As shown in the following networking, the interfaces connecting R1, R2, R3, R4, and R5 are running OSPF, and are all in area 0. The routing table of R1 has two equal-cost routes to the destination 10.1.35.0/24. In order for the forwarding path R1 -> R4 -> R3 to be preferentially selected, which of the following configuration should be performed?
Understand the Problem
The question is asking for a configuration change needed in a network using OSPF routing protocol to ensure a specific forwarding path is preferred. It involves analyzing the network topology and routing behavior.
Answer
Configure higher OSPF cost on R1 interfaces to R2 than to R4.
To preferentially select the path R1 -> R4 -> R3, configure OSPF cost on the interfaces of R1 that connect to R2 to make them higher than those connecting to R4. This will cause OSPF to prefer the route through R4 due to lower cost.
Answer for screen readers
To preferentially select the path R1 -> R4 -> R3, configure OSPF cost on the interfaces of R1 that connect to R2 to make them higher than those connecting to R4. This will cause OSPF to prefer the route through R4 due to lower cost.
More Information
Open Shortest Path First (OSPF) uses cost to determine the best path. Increasing the cost on the interfaces to R2 will make OSPF prefer the lower-cost path through R4.
Tips
A common mistake is not adjusting the interface cost properly, which might not lead to the desired path being preferred.
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